Multitech MultiModemISDN MTA128ST-USB, User Manual

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Chapter 4 - AT Commands, S-Registers and Result Codes
MTA128ST-USB
S-Register: S44
Function:
POTS Port Ring Frequency
Unit: Decimal ASCII code
Range: 2–4
Default: 2 (25 Hz)
Description: Controls the ring frequency from the POTS port. S44=n where:
n=2 25 Hz ring frequency
n=3 20 Hz ring frequency
n=4 16.67 Hz ring frequency
S-register: S45
Function:
Use Dial Tone from Central Office
Unit: Decimal ASCII code
Range: n=0 No dial tone
n=1 Use Central Office dial tone
n=2 TA generates dial tone
Default: 1 (Use Central Office dial tone)
Description: S45 allows the TA either to generate a dial tone on the POTS port, block any
dial tone on the POTS port, or allow the dial tone from the central office to
pass through to the POTS port (default). Some countries have central offices
that send a loud dial tone through to the POTS port. This makes DTMF-
dialing difficult since DTMF digits have to overcome the loudness of the dial
tone (see S49 and S51 for more information).
S-Register: S46
Function:
Pulse-Dial Recognition
Unit: Decimal ASCII code
Range: 0–3
Default: 0
Description: Controls pulse-dial recognition for New Zealand, Sweden, and the de facto
standard for the rest of the world (England, France, India, and USA). S46
selects country where the TA is being used to recognize pulse-dialing. S46=n
where:
n=0
Disable pulse-dialing (default)
n=1 England, France, India, USA, etc. (# pulses = digit dialed except 0 is
10 pulses)
n=2 New Zealand (# pulses = 10 digits dialed)
n=3 Sweden (# pulses = digit 1)
S-register: S49
Function:
POTS Port Dial Tone Gain
Unit: Decimal ASCII code
Range: n=0 (Low gain—quiet) thru 10 (high gain—loud)
Default: 0 (Low gain—quiet)
Description: Allows POTS port dial tone gain to be adjusted to an appropriate volume.
Must be used in conjunction with S51=1 in order for there to be a noticed
change in the dial tone volume. See S51.